Improvement in head-blocks foe saw-mills



i @stuiten tatrafglatent @fitta JONATHAN Al. HAYNES, OF BEDFORD,ASSIGNOR TO HIMSELF AND SAMUEL IMPROVEMENT IN HEAD-BLOCKS FOR SAW-MILLS.

dita .rlgehnh nient tu in tiges Enters tant :un making aan nf the time.

TO ALL WHOM IT MAY CONCERN:

Be it known thatiI, JONATHAN P. HAYNES, of Bedford, in the county ofHillsboro, and State of New Hampshire, have invented a new and usefulImprovement in Saw-Mills; and I do hereby declare the following to be afull, clear, and exact description thereof, reference boing had to theaccompanying drawings, figures,

and letters of reference thereon, making part of this specification. Inthe said drawings- Figure 1 represents a front view, in perspective, ofthe carriage.

Figure 2 is a view of the cranks and connections.

Figure 3 is a top view of the left-hand block.

Figure Lis an under side view of the same; andv Figures 5, 6, and 7 areside, rear, and bottom views of the left log-rest.

Similar letters of reference indicate like parts in all the accompanyingdrawings.

' My invention consists, first, in a novel combination and arrangementof parts for operating the set of the log upon the carriage; second, ina novel combination and arrangement of parts for readily determining theset of the log; third, in a novel combination and arrangement of partsfor connecting and disconnecting the traversing-gear from the rests, sothat the rests can be operated quickly.

To enable others skilled in the art to make and use my invention, I willdescribe the `construction and operation thereof.

A represents the bed of the carriage, secured together-by cross-bars BB, as shown in figs. 3 and 4. D D are the log-rests, which traverse onthe blocks C C. E is the rod, which connects the racks P P by means ofthe bell-cranks G G. H is the hand-lever attached to the shaft F, foroperating the set. I I are adjustable stops on the rod E, to regulatethe extent of motion of the lever H, and consequently of the log-rests DDl These stops strike against the slotted bar K, secured'to theright-hand block, shown in figs. 1 and 2. L L are the boxes for thejournals ofthe bell-cranks G G, the continuation of the right-handjournal forming the shaft F. Mis a circular block,'playing freely uponthe end of the upright shaft N, and to whichone end of the metallicgraduated tape m is attached, the .other end being secured to theupright O. Theinner end of the coil spring n is Asecured to the shaft N,while the-outer one is attached to a pin in the under side of the blockM. To the end of the shaft N. is attached the index-finger o. The shaftN being secured to the log-rest D, the distance the rest has travelledis shown on the measure m by the index o. Mounted upon the `log-rests Dare small shafts, c, arouhd which are springs, e, the upper ends ofwhich are secured to the projections a, and the other ends to thecollars on the shafts c. The upper ends of the shafts are secured to thearms b,-and the lower ends to the pawls 7c, as shown in figs. 6 and 7.The small eccentrics and handles d, mounted inthe projections u, are forthe purpose of throwing the. pawls z' la clear ofl the. racks Pp, whenit is required to move the rests D. Upon the inside of the rests D areshown small pawls, z', which are thrown outward by the spring h,- andeng'age with the racks p' on the inside of the blocks C, as representedin fig. 4, and which prevent anyretrograde movement of the rest-s.' Thepawls c and i are so arranged that they are thrown out of cr into gearat the same time by the movement of the handles d. When both -of thepawls-are clear of the ratchets, thelog-rests may be moved to anydesired position, and then be thrown into gearby a slight turn of thehandles d. The rests D are grooved, as shown, to slide in the blocks,and are furnished with a series of dog-holes, for (logging the log inany desired position by 'means of. the dogs l. In .the b ar E there is aseries of holes, and on the side of the carriage there is a series ofstops, for adjusting the blocks C C any desired distance apart, which isaccomplished by with= drawing the pin in the left crank Gr, moving theblock to the desired position, and then inserting the pin. The left-handblock C is provided with a scale, and its log-rest with a pointerr r,for facilitating the adjustment of logs which are tapering or crooked.

ff Operation. The operation will be as follows: The log is placed uponthe carriage-blocks C C, which have been adjusted to the properdistance, and dogged firmly by means of hooks pivoted to the rests -D D,in the ordinary manner, and the log is set by'simply working the lever Hback and forth, the rests D being moved simultaneously. The

distance they have travelled is indicated on the tape m by the index aiThe position 'of the hand-lever and tape m enables one person to set thelog with great ease, and every board is cut of a perfect thickness.

My improvements are applicable to all saw1i1ills,a.nd the wholeapparatus is simple, with but little friction, and is easily operated ata great lsaving of labor and time.

Having thus described my invention, what 1 claim, and desire to secureby Letters Patent, is- 1. The arrangement of theratchet-bar P and finger7c in connection with and for operating the knee D, all constructedandoperating substantially as described and specified.

2. The arrangement of the tape-measure m, index-finger o, and spring n,mounted on the 'shafts O and N,

for registering the set of the log, all constructed and operatingsubstantially as described and specified.v

3. The arrangement of the eccentric-handle d', a-rm b, shaft c, and thepawls z'and c, for disconnecting the traversing-gear, so that the kneesD are free to be moved in either direction, all constructed andoperating substantially as described and specied.

' J. P. HAYNES.

Witnesses:

ISAAC RIDDLE, B. A. CILLEY.

